Motor control.



010077030. PATENTED JAN. 21, 1908.

K. E. ZIX.

MOTOR CONTROL.

APPLIOATION FILED JULY 25,1906.

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J 2- a H Witnesses: lnvzntoi" %w 6 Karl Eduard Zi X.

' Figure 1 shows an electric motor arranged CARL EDUARD ZIX, OF BERLIN, GERMAliY, ASSIGNOR TO GENERAL ELEGTR-IEG OGMBEDTY,

A CORPORATION OF NEW YORK.

MGTOR lilo. 87?,030. Specification of Letters Ectented El av i Application filed July 25. 1906; Serial lilo. 321L976- To all wlio'mit may concern: ermcture terminal is connected. The other Be it known that l, "CARL EDUARD Z112, l ari'neture' terminal is connected through subject of the Emperor of Germany, residirn t t-Berlin, Germany, have invented certain new and. useful Improvements in Motor @on trol, of which the following is a. specification.

My invention relates to the control of electrio motors from a. distance, and particularly E'represents a vertical reciprocating memto the control of motors driving member, ber carrying a. coin portion (I adopted to em 1' ground tonne of the'source of cursuch as a railway track switch, which must I gage it pin 9 on: the horizontelly-reciprocet- 5 rent indicetedby the battery B.

C re iresents a; controlling: handle connect 60 ed to the switch contacts 0 in: circuit With theouter terminolsof the two field. portions.

7 "1 ,L 1 .L oeseciproceted. mg member. it, so as b0 move member lt tolin order to reverse an electric motor with Ward the righti'n Fig. 1 whenever member? the minimum number of leads from the is moved up or down. source of current to the motor, it has he e represents a spring, which sets to return 1-5 quently been the practice heretofore to dimember E when released to the 70 vide the field winding of the motor into two shown in the portions, to the junction of which one termil Contact 5, and at it ne i oi the armature is connected. The other to be engaged by h 7 controlled by the arma ure terminal is connected to one termil armature oi electroiusgnet l3. This electrol l l re. lilember E carries s opposite end 13 arranged nel o no source, :unl he other terminal of 1132]. it may he COlllLl'OllOLl by the track the source is connected. alternately to the swit m or other device driven by the motor A two outer terminal of the two iiehl portions, in any of the well known methods ordinarily for opposite directions of rotation. Such an employed in interlocking machines for rails :irrengen'ient requires only three leads, or Weyswitches sndsignels. The armature of earth is used for one connection, only two this magnet may also control an indicator G lhiserraticgenient has the disudvsnto give 9. return indication of the movement tags, however, that half the field winding is oi the device driven by the motor. alweysidle. I The, oper tion of the switches shown in The object of my invention is to increase Fig. 1 is as follows: With the switches in 30 the output of such a motor without increosthe position. shown, the upper terminal of the ing the number of control leads. I sccombuttery B is opcn-circuited, and no current plish this by connecting in shunt to the crflows. Now, if handle Q is .n'ioved (lO'V-Tl'l mature the portion of the field winding which, l ward and contacts 0 thrown to the oppositein the ordinary arrangement, is idle. This position, the upward inoveinentof the com (Z 35 shunt connection may be made without inl will throw member E toward the right into 90 crecsinv the number of leads, and by its use position to be locked by cstchf. This-moveall the neld winding is active for both (lirecl ment of member E shifts switch contact 8 to tions of rotation. l the right. A circuit is then closed from the lily invention further comprises orrsnging l upper terminal of the, battery, through 40 amenually-controlled switch and means conswitch 0, ti rough left-hand switch 0, to the c trolled by the movement oi the motor coopouter terminal of field minding c Passing crating with the mununlly-controlled switch l from. this port-ion of the field winding, the to make the onnectious described above, 5 current divides, part passing through armaend also to break the motor circuit autoiust- I turc A and earth to the lower terminal of icslly when the driven member reaches its batteryRtmd the other :irtpassing' through limit oimoveiueul' in either direction. the field portion a am through the righti l l l l l My invention will best be understood by luuul switch 0 to the lower battery terminal. -erence to the eccoiupenying drawing, in Field portion a' is thus connected in series which with the armature, and llelil portion a in shunt to armature. N ow, when magnet F is energized momentarily by a completion of the movement of the device driven by the In Fig. 1, it represents the motor armature, motor, its armature is-raised, unlotching the and a and c represent the two halves of the catch F and permitting member E to be re 55 held- 'sinding, to the junction 0; which "one 1 turned to the position shown by the spring; no

for control in accordance with my invention end Fig. 2 shows it modification thereoi'.

throw switch H arranged to connect Now, if handle C is raised again to the positionshown in Fig. 1 switches 0 will be returned to the position shown,. and the downward movement of the member (1 will again shift member E toward the right to be latched by catch The circuit is then closed from the up or erminal of battery B through switch 6 an lei t-hand 'switchc to the outer terminal of field ortion (1 After passing through this fiel portion, the current divides, part pessin through the armature, and thence throng earth to the lower terminal of battery B; the other art passing through field portion of and rig it-hand switchc to lower terminal of battery B. Field portion a is now in series to, the armature and field portion a in shunt, and the direction of current through bothfield portions has been reversed. The motor consequently rotates in the other direction. When the limit of movement is reached, the magnet F is again momentarily energized, and member E is released, returning switch 8 to the position shown in the figure, and breaking the motor circuit. All parts will, .then be restored to the position shown in Fig. 1.

It will be seen that after the movement of the device driven by the motor has been completed and memberE returns to the position shown in the drawing, switch 6 connects together the two outer terminals of the motor eld portions, so that any leakage current due to a ground on any circuit will ass throughthe two portions of the field win-din in opposite directions, so thtttr'io torque wi be produced in the motor. Thus, the motor when atrest is'completely protected from leakage currents.

In Fig. 2 I have shown a somewhat modi fied arrangement of circuits, the connecting together ofthe' outer terminals of the two ortions of the field winding when the motor is at rest being omitted in order to simplify the figure. I have shown a simple twoone terminal of battery B to either of,two leads which extend to the motor. I have shown in this figure a reciprocating member I connected to a track-switch J, which member is geared to the motor in any suitable way, so as to be driven thereby. A switch K is controlled by lugs i on the member I.

The operation of this modification. is as follows: With switches H and K in the position shown, the circuit of the battery B is opened. In order to shift the track switch, switch H is thrown to its other position, thereby closing a circuit from the upper terminal of battery B to switch K, thence through field portion (1 and thence in parallel through the motor armature, field portion o to ground, and thence to the lower battery terminal. The motor consequently starts, shifting member I toward the left. ll hen the limit of movement is reached the emcee right-hand lug i engages switch K, and

throws it to the left; thereby opening the circuit of the motor. To return the track switehto its other position, switch H is returned to the position shown in the drawing. A circuitwill then be closed from the u per terminal of battery B, through switch 7 ,to field portion a and thence through the armature and field portions a in parallel.

'The motor then rotates in the opposite direction, shifting member I toward the right until the left-hand lug i engages switch K and returns it to the position shown in Fig. 2. The device driven by the motor thus controls directly a switch in the motor cir-- cuit, instead of indirectly, as in Fig. 1.

Many other modifications may be employed, and consequently I'do not desire to 'mit myself to the particular construction and arrangement of arts here shown, but aim in the appended cFaims to cover all modifications which are within thescope of my invention. a

What I claim as new, and desire to secure by Letters Patent of the United States, is,

1. In combination, an electric motor hav ing. a divided field winding, a source of current therefor, and controlling means adapted to connect one portion of the field winding in series with the motor armature and the sec end portion in shunt for one direction of rotation and to connect the second portion in series and the first in shuntfor the opposite direction of rotation.

2. In combination, an electric motor having adivided field winding, a source of current therefor, a connection from one armature terminal to the junction of the two field portions," a connection from the other armature vterminal to one terminal of the source, and means for connecting the outer terminal of each field portion alternately to the two terminals of the source to reverse the distant point, a connection from the second:

armature terminal to one terminal of the source, two leads from the source to the motor, a switch at the source arranged to connect the second terminal of the source alternately to said two leads, and a switch controlled by the movement of the motor arranged to connect the outer terminal of each field portion alternately to one of said leads and to the second armature terminal.

. 4. In combination, an electric motor having a divided field winding, a member to be reciprocated thereby, a source of current for the motor, a manually-controlled switch, and means controlled by the movement motor cooperating with said switch to com series and emcee nect each portion of the field alternately in in shunt to the armature for 0 posite directions of rotation-and to break t e motor circuit automatically when the reciprocating member has completed its move- -ment in either direction.

5. In combination, an electric motor having a divided field winding, a source of cur rent therefor, controlling means adaptedto connect one portion of the field Winding in series with the motor armature and the sec:

ond portion in shunt for one direction of rotation, to connect the second portion in series and the first in shunt for opposite direction of rotation, and to connect the two field portions in parallel when the motor is at rest.

6. in combination, an electric motor having a divided field winding, a source of current therefor a connection from one armature terminalto the junction of the two field portions, a connection from the otherarmw, ture terminal to one terminal of the source, and means for connecting the outer terminal of each 'field ortion alternately to the two terminals of t e source to reverse the motor and for disconnecting the outer teri'ninals of the field ortions from the source and con-- necting' t em together to stop the motor.

In Witness whereof, I have hereunto set my hand this 7th day of July, 1906. 4

- CARL EDUARD ZIX. Witnesses JULIUS RUMLAND, MUN HANDLEE. 

